Commit | Line | Data |
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9a8fd558 CZ |
1 | /* |
2 | * include/asm-xtensa/bitops.h | |
3 | * | |
4 | * Atomic operations that C can't guarantee us.Useful for resource counting etc. | |
5 | * | |
6 | * This file is subject to the terms and conditions of the GNU General Public | |
7 | * License. See the file "COPYING" in the main directory of this archive | |
8 | * for more details. | |
9 | * | |
ef6051a9 | 10 | * Copyright (C) 2001 - 2007 Tensilica Inc. |
9a8fd558 CZ |
11 | */ |
12 | ||
13 | #ifndef _XTENSA_BITOPS_H | |
14 | #define _XTENSA_BITOPS_H | |
15 | ||
16 | #ifdef __KERNEL__ | |
17 | ||
18 | #include <asm/processor.h> | |
19 | #include <asm/byteorder.h> | |
20 | #include <asm/system.h> | |
21 | ||
22 | #ifdef CONFIG_SMP | |
23 | # error SMP not supported on this architecture | |
24 | #endif | |
25 | ||
9a8fd558 CZ |
26 | #define smp_mb__before_clear_bit() barrier() |
27 | #define smp_mb__after_clear_bit() barrier() | |
28 | ||
d4337aa5 AM |
29 | #include <asm-generic/bitops/atomic.h> |
30 | #include <asm-generic/bitops/non-atomic.h> | |
9a8fd558 | 31 | |
288a60cf | 32 | #if XCHAL_HAVE_NSA |
9a8fd558 | 33 | |
ef6051a9 | 34 | static inline unsigned long __cntlz (unsigned long x) |
9a8fd558 CZ |
35 | { |
36 | int lz; | |
37 | asm ("nsau %0, %1" : "=r" (lz) : "r" (x)); | |
ef6051a9 | 38 | return lz; |
9a8fd558 CZ |
39 | } |
40 | ||
9a8fd558 CZ |
41 | /* |
42 | * ffz: Find first zero in word. Undefined if no zero exists. | |
43 | * bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1). | |
44 | */ | |
45 | ||
ef6051a9 | 46 | static inline int ffz(unsigned long x) |
9a8fd558 | 47 | { |
ef6051a9 | 48 | return 31 - __cntlz(~x & -~x); |
9a8fd558 CZ |
49 | } |
50 | ||
51 | /* | |
52 | * __ffs: Find first bit set in word. Return 0 for bit 0 | |
53 | */ | |
54 | ||
ef6051a9 | 55 | static inline int __ffs(unsigned long x) |
9a8fd558 | 56 | { |
ef6051a9 | 57 | return 31 - __cntlz(x & -x); |
9a8fd558 CZ |
58 | } |
59 | ||
60 | /* | |
61 | * ffs: Find first bit set in word. This is defined the same way as | |
62 | * the libc and compiler builtin ffs routines, therefore | |
63 | * differs in spirit from the above ffz (man ffs). | |
64 | */ | |
65 | ||
ef6051a9 | 66 | static inline int ffs(unsigned long x) |
9a8fd558 | 67 | { |
ef6051a9 | 68 | return 32 - __cntlz(x & -x); |
9a8fd558 CZ |
69 | } |
70 | ||
71 | /* | |
72 | * fls: Find last (most-significant) bit set in word. | |
73 | * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32. | |
74 | */ | |
75 | ||
ef6051a9 | 76 | static inline int fls (unsigned int x) |
9a8fd558 | 77 | { |
ef6051a9 | 78 | return 32 - __cntlz(x); |
9a8fd558 | 79 | } |
ef6051a9 CZ |
80 | |
81 | #else | |
82 | ||
83 | /* Use the generic implementation if we don't have the nsa/nsau instructions. */ | |
84 | ||
85 | # include <asm-generic/bitops/ffs.h> | |
86 | # include <asm-generic/bitops/__ffs.h> | |
87 | # include <asm-generic/bitops/ffz.h> | |
88 | # include <asm-generic/bitops/fls.h> | |
89 | ||
90 | #endif | |
91 | ||
d4337aa5 AM |
92 | #include <asm-generic/bitops/fls64.h> |
93 | #include <asm-generic/bitops/find.h> | |
94 | #include <asm-generic/bitops/ext2-non-atomic.h> | |
9a8fd558 CZ |
95 | |
96 | #ifdef __XTENSA_EL__ | |
de4f6e5b CZ |
97 | # define ext2_set_bit_atomic(lock,nr,addr) \ |
98 | test_and_set_bit((nr), (unsigned long*)(addr)) | |
99 | # define ext2_clear_bit_atomic(lock,nr,addr) \ | |
100 | test_and_clear_bit((nr), (unsigned long*)(addr)) | |
9a8fd558 | 101 | #elif defined(__XTENSA_EB__) |
de4f6e5b CZ |
102 | # define ext2_set_bit_atomic(lock,nr,addr) \ |
103 | test_and_set_bit((nr) ^ 0x18, (unsigned long*)(addr)) | |
104 | # define ext2_clear_bit_atomic(lock,nr,addr) \ | |
105 | test_and_clear_bit((nr) ^ 0x18, (unsigned long*)(addr)) | |
9a8fd558 CZ |
106 | #else |
107 | # error processor byte order undefined! | |
108 | #endif | |
109 | ||
d4337aa5 | 110 | #include <asm-generic/bitops/hweight.h> |
26333576 | 111 | #include <asm-generic/bitops/lock.h> |
d4337aa5 AM |
112 | #include <asm-generic/bitops/sched.h> |
113 | #include <asm-generic/bitops/minix.h> | |
9a8fd558 CZ |
114 | |
115 | #endif /* __KERNEL__ */ | |
116 | ||
117 | #endif /* _XTENSA_BITOPS_H */ |